The Pelt of Charandis (Magic Armour)

The cloak confers a +3 armour saving throw bonus against shooting and +2 against attacks in hand-to-hand combat.
This gives Korhil an armour save of 3+ and 4+ respectively.
Even more usefully the enchantment of the cloak protects Korhil from all poisons, including the Black Venom of the Dark Elf Assassins, the toxins employed by Witch Elves, and the Weeping Blades of Skaven assassins.
Poisoned weapons and other attacks lose any special benefits, but otherwise count as normal weapons of their type.